Fills the user-allocated 8-bit LUT with values ranging between the startColor and endColor colors according to the selected LUT type.
public static void WindowLevelFillLookupTable(
RasterColor[] lookupTable,
RasterColor startColor,
RasterColor endColor,
int low,
int high,
int lowBit,
int highBit,
int minValue,
int maxValue,
int factor,
RasterPaletteWindowLevelFlags flags
)
Public Shared Sub WindowLevelFillLookupTable( _
ByVal lookupTable() As Leadtools.RasterColor, _
ByVal startColor As Leadtools.RasterColor, _
ByVal endColor As Leadtools.RasterColor, _
ByVal low As Integer, _
ByVal high As Integer, _
ByVal lowBit As Integer, _
ByVal highBit As Integer, _
ByVal minValue As Integer, _
ByVal maxValue As Integer, _
ByVal factor As Integer, _
ByVal flags As Leadtools.RasterPaletteWindowLevelFlags _
)
+(BOOL)windowLevelFillLookupTable:(NSArray*)lookupTable
startColor:(LTRasterColor*)startColor
endColor:(LTRasterColor*)endColor
low:(int)low
high:(int)high
lowBit:(unsigned int)lowBit
highBit:(unsigned int)highBit
minValue:(int)minValue
maxValue:(int)maxValue
factor:(int)factor
flags:(LTRasterPaletteWindowLevelFlags)flags
error:(NSError**)outError;
public:
static void WindowLevelFillLookupTable(
Leadtools.array<RasterColor>^ lookupTable,
Leadtools.RasterColor startColor,
Leadtools.RasterColor endColor,
int low,
int high,
int lowBit,
int highBit,
int minValue,
int maxValue,
int factor,
Leadtools.RasterPaletteWindowLevelFlags flags
)
lookupTable
Pointer to an array to be updated with the 8-bit RGB quad (i.e. lookup table).
startColor
Starting color value for the gradient.
endColor
Ending color value for the gradient.
low
The low value of the window width, in pixels.
high
The high value for the window width, in pixels.
lowBit
Value indicating the low bit used for leveling.
This is normally 0 and should be less than the highBit.
highBit
Value indicating the high bit used for leveling.
This should be greater than or equal to lowBit and less than 11 for 12-bit grayscale or 15 for 16-bit grayscale.
minValue
The image minimum value. This value can be obtained using MinMaxValuesCommand.
maxValue
The image maximum value. This value can be obtained using MinMaxValuesCommand.
factor
Value that indicates the factor to be applied in the method operation specified in the flags parameter.
This parameter is used only if flags is RasterPaletteWindowLevelFlags.Exponential, RasterPaletteWindowLevelFlags.Logarithmic or RasterPaletteWindowLevelFlags.Sigmoid.
If RasterPaletteWindowLevelFlags.Exponential or RasterPaletteWindowLevelFlags.Sigmoid is specified, its value can be any integer (+/-). If RasterPaletteWindowLevelFlags.Logarithmic is specified, its value should be >>= 0
. If factor = 0, the lookup table will be filled linearly.
flags
Flags that indicate how the range is used to fill and the type of the lookup table and whether it contains signed or unsigned data.
This method is available in the Medical Toolkits.
Use this method to fill in the lookup table, used in RasterImage.WindowLevel, according to the lookup table type flag.
The lookup table will be filled as follows:
Inside/Outside | MinValue-Low | Low-High | High-MaxValue |
---|---|---|---|
RasterPaletteWindowLevelFlags.Inside | solid black (0,0,0) | color gradient ranging from startColor to endColor | solid white (255,255,255) |
RasterPaletteWindowLevelFlags.Outside | solid color (startColor) | grayscale values from solid black (0,0,0) to solid white (255, 255, 255) | solid color (endColor) |
RasterPaletteWindowLevelFlags.Inside | RasterPaletteWindowLevelFlags.DicomStyle | None | color gradient ranging from startColor to endColor | None |
RasterPaletteWindowLevelFlags.Outside | RasterPaletteWindowLevelFlags.DicomStyle | solid color (startColor) | color gradient ranging from startColor to endColor | solid color (endColor) |
To fill a 16-bit lookup table use WindowLevelFillLookupTableExt.
Only TIFF and DICOM file formats are capable of saving images that have been window-leveled.
Images can be window-leveled by calling RasterImage.WindowLevel and specifying RasterWindowLevelMode.PaintAndProcessing for the flags parameter, by using the WindowLevelCommand or by loading an image from a file format that supports Window Leveling.
If a window-leveled image is saved as any other file format, the image data will be converted before being saved. For more information, refer to Saving Window-Leveled Images.
LEADTOOLS supports two types of LUTs for 10-16-bit grayscale images (8-bit LUT and 16-bit LUT). Typical grayscale image display and processing is done using an 8-bit LUT. But, you can also use a 16-bit LUT, which offers more precision. Some special video cards and monitors also support display of grayscale images using a 16-bit LUT.
For more information, refer to Introduction to Image Processing With LEADTOOLS.
For more information, refer to Grayscale Images.
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Core;
using LeadtoolsExamples.Common;
public void WindowLevelFillLookupTableExample()
{
RasterCodecs codecs = new RasterCodecs();
codecs.ThrowExceptionsOnInvalidImages = true;
string srcFileName = Path.Combine(ImagesPath.Path, "Image1.cmp");
string destFileName = Path.Combine(ImagesPath.Path, "Image1_WindowLevel.tif");
// Load an image as 8 bits/pixel
RasterImage image = codecs.Load(srcFileName, 8, CodecsLoadByteOrder.Rgb, 1, 1);
// change the image to be 16-bit grayscale
GrayscaleCommand grayscaleCmd = new GrayscaleCommand(16);
grayscaleCmd.Run(image);
// get the lookup table size
int lookupTableSize = 1 << (image.HighBit - image.LowBit + 1);
// get low/hight bits and minimum/maximum value of this grayscale image
MinMaxBitsCommand minMaxBitsCmd = new MinMaxBitsCommand();
minMaxBitsCmd.Run(image);
int lowBit = minMaxBitsCmd.MinimumBit;
int highBit = minMaxBitsCmd.MaximumBit;
MinMaxValuesCommand minMaxValuesCmd = new MinMaxValuesCommand();
minMaxValuesCmd.Run(image);
int minVal = minMaxValuesCmd.MinimumValue;
int maxVal = minMaxValuesCmd.MaximumValue;
// create the lookup table
RasterColor[] lookupTable = new RasterColor[lookupTableSize];
RasterPaletteWindowLevelFlags flags =
RasterPaletteWindowLevelFlags.Inside |
RasterPaletteWindowLevelFlags.Linear;
if (image.Signed)
flags |= RasterPaletteWindowLevelFlags.Signed;
// initialize the fill lookup table parameters
RasterColor startColor = RasterColor.FromKnownColor(RasterKnownColor.Red);
RasterColor endColor = RasterColor.FromKnownColor(RasterKnownColor.Blue);
int low = 23000;
int high = 45000;
int factor = 10;
// fill the lookup table
RasterPalette.WindowLevelFillLookupTable(
lookupTable,
startColor,
endColor,
low,
high,
lowBit,
highBit,
minVal,
maxVal,
factor,
flags);
// now do window level on the image
image.WindowLevel(
lowBit,
highBit,
lookupTable,
RasterWindowLevelMode.PaintAndProcessing);
// save it back on disk
codecs.Save(image, destFileName, RasterImageFormat.Tif, 16);
// Clean up
image.Dispose();
}
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing
Imports Leadtools.ImageProcessing.Core
Public Sub WindowLevelFillLookupTableExample()
Dim codecs As RasterCodecs = New RasterCodecs()
codecs.ThrowExceptionsOnInvalidImages = True
Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp")
Dim destFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1_WindowLevel.tif")
' Load an image as 8 bits/pixel
Dim image As RasterImage = codecs.Load(srcFileName, 8, CodecsLoadByteOrder.Rgb, 1, 1)
' change the image to be 16-bit grayscale
Dim grayscaleCmd As GrayscaleCommand = New GrayscaleCommand(16)
grayscaleCmd.Run(image)
' get the lookup table size
Dim lookupTableSize As Integer = 1 << (image.HighBit - image.LowBit + 1)
' get low/hight bits and minimum/maximum value of this grayscale image
Dim minMaxBitsCmd As MinMaxBitsCommand = New MinMaxBitsCommand()
minMaxBitsCmd.Run(image)
Dim lowBit As Integer = minMaxBitsCmd.MinimumBit
Dim highBit As Integer = minMaxBitsCmd.MaximumBit
Dim minMaxValuesCmd As MinMaxValuesCommand = New MinMaxValuesCommand()
minMaxValuesCmd.Run(image)
Dim minVal As Integer = minMaxValuesCmd.MinimumValue
Dim maxVal As Integer = minMaxValuesCmd.MaximumValue
' create the lookup table
Dim lookupTable As RasterColor() = New RasterColor(lookupTableSize - 1) {}
Dim flags As RasterPaletteWindowLevelFlags = RasterPaletteWindowLevelFlags.Inside Or RasterPaletteWindowLevelFlags.Linear
If image.Signed Then
flags = flags Or RasterPaletteWindowLevelFlags.Signed
End If
' initialize the fill lookup table parameters
Dim startColor As RasterColor = RasterColor.FromKnownColor(RasterKnownColor.Red)
Dim endColor As RasterColor = RasterColor.FromKnownColor(RasterKnownColor.Blue)
Dim low As Integer = 23000
Dim high As Integer = 45000
Dim factor As Integer = 10
' fill the lookup table
RasterPalette.WindowLevelFillLookupTable(lookupTable, startColor, endColor, low, high, lowBit, highBit, minVal, maxVal, factor, flags)
' now do window level on the image
image.WindowLevel(lowBit, highBit, lookupTable, RasterWindowLevelMode.PaintAndProcessing)
' save it back on disk
codecs.Save(image, destFileName, RasterImageFormat.Tif, 16)
' Clean up
image.Dispose()
End Sub
Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
using Leadtools;
using Leadtools.Codecs;
using Leadtools.Examples;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Core;
using Leadtools.Windows.Media;
public void WindowLevelFillLookupTableExample(RasterImage image, Stream destStream)
{
// image should be 8 bits/pixel
RasterCodecs codecs = new RasterCodecs();
codecs.ThrowExceptionsOnInvalidImages = true;
// change the image to be 16-bit grayscale
GrayscaleCommand grayscaleCmd = new GrayscaleCommand(16);
grayscaleCmd.Run(image);
// get the lookup table size
int lookupTableSize = 1 << (image.HighBit - image.LowBit + 1);
// get low/hight bits and minimum/maximum value of this grayscale image
MinMaxBitsCommand minMaxBitsCmd = new MinMaxBitsCommand();
minMaxBitsCmd.Run(image);
int lowBit = minMaxBitsCmd.MinimumBit;
int highBit = minMaxBitsCmd.MaximumBit;
MinMaxValuesCommand minMaxValuesCmd = new MinMaxValuesCommand();
minMaxValuesCmd.Run(image);
int minVal = minMaxValuesCmd.MinimumValue;
int maxVal = minMaxValuesCmd.MaximumValue;
// create the lookup table
RasterColor[] lookupTable = new RasterColor[lookupTableSize];
RasterPaletteWindowLevelFlags flags =
RasterPaletteWindowLevelFlags.Inside |
RasterPaletteWindowLevelFlags.Linear;
if (image.Signed)
flags |= RasterPaletteWindowLevelFlags.Signed;
// initialize the fill lookup table parameters
RasterColor startColor = RasterColorConverter.FromColor(Colors.Red);
RasterColor endColor = RasterColorConverter.FromColor(Colors.Blue);
int low = 23000;
int high = 45000;
int factor = 10;
// fill the lookup table
RasterPalette.WindowLevelFillLookupTable(
lookupTable,
startColor,
endColor,
low,
high,
lowBit,
highBit,
minVal,
maxVal,
factor,
flags);
// now do window level on the image
image.WindowLevel(
lowBit,
highBit,
lookupTable,
RasterWindowLevelMode.PaintAndProcessing);
// save it back on disk
codecs.Save(image, destStream, RasterImageFormat.Tif, 16);
// Clean up
image.Dispose();
}
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing
Imports Leadtools.ImageProcessing.Core
Imports Leadtools.Windows.Media
Public Sub WindowLevelFillLookupTableExample(ByVal image As RasterImage, ByVal destStream As Stream)
' image should be 8 bits/pixel
Dim codecs As RasterCodecs = New RasterCodecs()
codecs.ThrowExceptionsOnInvalidImages = True
' change the image to be 16-bit grayscale
Dim grayscaleCmd As GrayscaleCommand = New GrayscaleCommand(16)
grayscaleCmd.Run(image)
' get the lookup table size
Dim lookupTableSize As Integer = 1 << (image.HighBit - image.LowBit + 1)
' get low/hight bits and minimum/maximum value of this grayscale image
Dim minMaxBitsCmd As MinMaxBitsCommand = New MinMaxBitsCommand()
minMaxBitsCmd.Run(image)
Dim lowBit As Integer = minMaxBitsCmd.MinimumBit
Dim highBit As Integer = minMaxBitsCmd.MaximumBit
Dim minMaxValuesCmd As MinMaxValuesCommand = New MinMaxValuesCommand()
minMaxValuesCmd.Run(image)
Dim minVal As Integer = minMaxValuesCmd.MinimumValue
Dim maxVal As Integer = minMaxValuesCmd.MaximumValue
' create the lookup table
Dim lookupTable As RasterColor() = New RasterColor(lookupTableSize - 1) {}
Dim flags As RasterPaletteWindowLevelFlags = RasterPaletteWindowLevelFlags.Inside Or RasterPaletteWindowLevelFlags.Linear
If image.Signed Then
flags = flags Or RasterPaletteWindowLevelFlags.Signed
End If
' initialize the fill lookup table parameters
Dim startColor As RasterColor = RasterColorConverter.FromColor(Colors.Red)
Dim endColor As RasterColor = RasterColorConverter.FromColor(Colors.Blue)
Dim low As Integer = 23000
Dim high As Integer = 45000
Dim factor As Integer = 10
' fill the lookup table
RasterPalette.WindowLevelFillLookupTable(lookupTable, startColor, endColor, low, high, lowBit, highBit, minVal, maxVal, factor, flags)
' now do window level on the image
image.WindowLevel(lowBit, highBit, lookupTable, RasterWindowLevelMode.PaintAndProcessing)
' save it back on disk
codecs.Save(image, destStream, RasterImageFormat.Tif, 16)
' Clean up
image.Dispose()
End Sub
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